One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10,13,16)(11,17,19,14)(12,20,21,15)(18,22,24,23)(25,26,29,33)(27,35,38,31)(28,32,41,47)(30,34,42,48)(36,49,51,43)(37,46,40,44)(39,45,52,55)(50,56,53,54)(9,11,13,19)(10,14,16,17)(12,18,21,24)(15,22,20,23)(27,36)(28,39)(30,42)(31,43)(32,45)(34,48)(35,49)(37,40)(38,51)(41,52)(44,46)(47,55)(2,6)(7,8)(25,27,30,36,29,38,42,51)(26,31,34,43,33,35,48,49)(28,40,39,53,41,37,52,50)(32,46,45,56,47,44,55,54)(1,3,5,4)(2,7,6,8)(9,12,13,21)(10,15,16,20)(11,18,19,24)(14,22,17,23)(28,41)(32,47)(37,40)(39,52)(44,46)(45,55)(50,53)(54,56)(1,4,5,3)(2,8,6,7)(11,19)(14,17)(18,24)(22,23)(25,28,30,39,29,41,42,52)(26,32,34,45,33,47,48,55)(27,37,36,50,38,40,51,53)(31,44,43,54,35,46,49,56)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.